Pectinida is a taxonomic order of large and medium-sized saltwater clams, marine bivalve molluscs, commonly known as scallops and their allies. It is believed that they began evolutionarily in the late Middle Ordovician epoch; many species, of course, are still extant.

Pectinida. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Pectinida.

The Pectinoidea are a superfamily of marine bivalve molluscs, including the scallops and spiny oysters.

Pectinoidea. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Pectinoidea.